Starting and stopping mechanism for presses.



J.y OUBLIER &,A. WF.. EDWARDS. STARTING ANU5s-T0PPING--MBGHwN-isufn PRESSES., APKPIIEIBATION IIUBDJQOTj .19; .19112.

1,083`g9i819; Panentedglamlis, 1914;.

J. V. COLLIER & A. W. EDWARDS. STARTING AND sToPPING MBCHANISM FOR PRESSES.

APPLICATION FILED OGT. 19, 1912.

Patented Jan 13, 1914.

3 SHEETS-SHEET 2.

J. V. COLLIER & A. W. EDWARDS.

STARTING AND sToPPING MECHANISM ron PRESSES.

APPLICATION FILED OCT. 10, 1912.

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Zal/@rdf UNTTED sTATEs PATENT oEEIcE.

JOHN VEASY COLLIER AND lARTHUR. WALLACE EDWARDS, OF NORTHAMPTON, ENG- LAND, ASSIGNORS T0 THE NORTHAMPTON MACHINERY C0. LIMITED, 0F NORTH- AMPToN, ENGLAND.

STARTING AND STOPPING AMECHANISIVI FOR PRESSES.

specification of Letters Patent.

Patented J an. 13, 1914'.

Application filed October 19, 1912. Serial No. 726,703.

To all whom it may' concern:

Be it known that we, Jol-1N VEAsr CoL- LIER and ARTHUR TALLACE EDWARDS, sub jects of the King of Great Britain, residing at Northampton, in the county of Northampton, England, have invented certain new and usefulY Improvements in or Relating to Starting and. Stopping Mechanism forf shaft, during which revolution the head or pressing member of the machine descends to perform the pressing or cutting operation and returns to its starting point in which `it occupies a raised position relatively to the Bed or table uponwhich the work is manipulated by the operator.

The invention relates to the type of ma-l chine which is started by the operator depressing a .treadle and the objects of the invention are to prevent the press ormachine -from repeatingxbv making a second revolution and to allow the operator after having depressed the treadle and started the machine to keep his foot upon the treadle .and maintain the latter in its depressed position until he is again ready to operate the l' machine, thereby avoiding the press being or equivalent.

accidentally started.

rllhe invention comprises mechanism or connections interposed between a cam or cams on the driving'shaft and the brake gear` and driving clutch to operate both of the latter for'automatically starting the press and stopping it after a complete cycle of operations or revolution of the driving shaft, Yduring which the head Vor pressing `member. ofthe press has descended to perfform the cutting out or pressing operation and risen again to its starting or inoperative position, the said mechanism being put in action uponV the depression of a foot treadle .ing cams l and The Ainvention will be described with reference to the accompanying drawings,y wherein Y l Figure l is a shortened front View of a press furnished with mechanism according to this invention. Fig. 2 is a cross sectional view of the press showing a side view of the mechanism of this invention in the normal or rest position. Fig. 3 is a similar view to Fig. 2 and shows the mechanism in section and in operation.

Like parts are designated by the same reference characters throughout the drawings.

The invention comprises two cams l and 2 (Figs. l and 2) mounted upon the driving shaft 3 and arranged in connection with a moving frame 4 so that as one cam l moves the frame in one direction the brake mechanism 5 is 4released and the clutch 6 thrown into gear and when the frame 4 is moved in the opposite direction by the'other cam (the stopping cam 2) the clutch is dis-v connected and the brake mechanism brought into action. A

The stopping cam 2 is arranged to come into operation at a convenient period before the driving shaft 3 completes 'its revolution and to cause the brake 5 to act with increasing power and resistance to stop the press at the proper time or prevent as far as possible any overrunning and consequent repeating movement of the head or presser member (not shown), y

The moving `frame may be of any suitable type but a convenient construction com;

.prises a pair of plates 4 united by bolt and nuts or equivalent and slotted at 7 (Figs. 2 and 3*) to straddle or pass over the driving shaft 3, each plate being provided with a roller 8 to engage its respective operat- 2. The slots 'Zin the said plates 4 are of such a length as to permit the plates or framing moving up and down in an approximately vertical plane. The sliding frame\'4 is connected atrits lower end tothe shaft 9 (which is usually the treadle shaft but in this case not so) of the press by mea-ns of a connecting link 10 and lever ll, the shaft 9 beingi'connected'to the brake 5 and clutch 6 of the press in the usual manner. The said cams l and 2 are s0 arranged `that during the rotation of the driving shaft 3 the sliding frame 4 is moved down bythe cam 1 and after the press4 has 'into operation, lowering release completed a certain part of a revolution the stopping cam 2 forces upward the sliding frame which thereupon through the medium of the lever 11 and shaft 9 disconnects the clutch 6 and applies the brake 5.

To start the press, the sliding frame 4 is disconnected from the treadle shaft 9 and lever 11 by suitable means such for example as a slip coupling worked by the treadle 12. This coupling consists of two dogs 13 (Figs. 2 and 3) pivoted at 14 on the sliding frame 4 and having at their -lower ends catches 15 or teeth which engage with a shoulder 16 on the connecting link 10 which connects the sliding frame to the treadle levier 11. 'lhe upper ends of the dogs 13 are normall y locked in the open or separated position (Fig.`2) by means of a locking device 17 and when so fastened the dogs 13 areheld with their catches 15 engaging the shoulder 16 thereby holding up the link 10. rl`he locking device 17 is in the form of a headed plunger slidable in the link 10 and pressed upward therein by a spring 18` (Fig. 3). The head of the plunger 17 is moved from between the upper ends of the dogs 13 (to release the latter) by depressing the plunger in the link. This may conveniently be effected by a finger 19 pivotally attached to the treadle lever 12el and which vas the treadle 12 is depressed rocks a detent 20 on i one of the dogs 13 to vice downward. The finger 19 may have a roller 21 on one side to run on the frame 4 the finger being pressed toward the frame by a spring 22. When the dogs 13 are released they are free to turn on their pivots 14 and release the connecting link 10 and thereby allow the lever 11 to descend (under the action of a spring 23, Fig. 1), thereby releasing the brake 5 and operating the clutch 6. In Fig. 3 the mechanism is shown just after release. rI he driving shaft. 3 then starts to move whereupon the cam 1 comes the sliding frame 4 until the catches 15'` on the dogs 13 come below the shoulder 16 on the connecting link 10 whereupon the pivoted dogs 13 turn on their pivots 14 foi` the catches y15 to move back into`position under the shoulder, and the device 17 actuated by the spring y18 moves between the upper ends of the dogs to lock them. When the stopping cam' 2 raises the sliding frame 4 the catches 15 engage the shoulder 16 and raise the link 10 and lever 11 thereby withdrawing the clutch 6.and applying the brake 5, which brings the press to rest at the 'completion of its revolution. i

The dogs 13 may be so arranged that after they are released they may e opened vto the link 10 by the downward 'pressure of the shoulder 16 upon the catches 15, and also when said catches pass below the shoulder the dogs may be .moved to press the locking devtreadle to allow the finger shaft, cams on the normal position by the pressure of the locking device 17 against the upper ends.

The stopping cam 2 is preferably arranged to raise the frame 4 and lever` 11 to stop the press before the end or highest point of the cam comes under the roller so that should the driving shaft tend to overrun, the cam 2 will raise the lever 11 higher to apply the kbrake with increasinggforce to bring the shaft 3 to rest.

The treadle 12 is mounted upon two short levers 12a fixed to a shaft 24 which works in hearings 25 secured preferably tothe floor in front of the press. When, upon the depression of the treadle 12 the finger 19 releases the pivoted dogs 13 in the manner aforesaid, the detent 2O is disengaged from the finger by the inward movement of the dog by which it is carried, thus if the treadle 12 is held depressed after the mechanism has again come to rest, the press cannot be again started without first releasing the 19 to return to its position under the detent 20.

Obviously a cam on the side of the sliding frame 4 and adapted to engage the roller 21 might be employed to withdraw the finger 19 from engagement with the detent 20 when the frame descends.

What we claim then is 1. In a press or like machine of the kind herein described, mechanism comprising a driving shaft, a sliding frame movable on said shaft, a cam on the driving shaft to move said frame in one direction, and a cam on the driving shaftrto move the frame in the opposite direction, a clutch and brake controlling member connecting means between said member and the sliding frame, means by which the operative connection bet-weenthe sliding frame and the clutch controlling member may be broken to start the machine, a treadle to actuate said means, a trip device adapted to disconnect the treadle from said means after actuating the same, and means to automatically restore the connection between the sliding frame and the controlling member during the operation of the machine so that the latter is automatically stopped on the completion of the cycle.

2. In a press or like machine of the kind herein described, mechanism comprising a driving shaft, a slide frame movable on said the latter to actuate the slide frame, a shaft controlling the clutch and brake of the machine, alever on Said shaft, a link to form an 4-`operative connection between said lever and the slide frame, pivoted catches on the slide frameadapted to automatically form an operative connection between the latter and the link so that the slide frame actuates the lever to stop the machine, a trip device to actuate the pivoted catches to disconnect the link from the slide frame so that the lever is'released to automatically start the machine, and a treadle to actuate said trip device.

3. In a press or like'machine of the kind herein described, mechanism comprising a driving shaft, a slide frame movable on said shaft, cams on the latter to actuate said slide frame, a shaft controlling the clutch and brake of the machine, a lever on said shaft, a link to form an operative connection between said lever and the slide frame, pivoted catches on the slide frame adapted to automatically form an operative connection between the latter and the link so that the slide frame actuates the lever to stop the machine, a spring actuated locking device adapted to lock the pivoted catches in e11- gagement with the link, a detent on one of said catches to unlock the catches, a treadle, and a pivoted finger actuated by said'trea dle to operate the detent the latter thereupon moving from out of engagement with the finger to render the treadle inoperative, substantially as and for the purpose described.

4 In a press or like machine of the kind herein described, mechanism comprising a driving shaft, a slide frame movable on the driving shaft, cams on the latter to actuate said slide frame, a shaft controlling the brake and clutch of the machine, a lever on said shaft, automatic means to form an operative connection between the slide frame and the lever so that the latter may be actuated thereby to stop the machine, means to render the connection between said slide frame and lever inoperative to efect the automatic starting of the machine,.and means to actuate the slide frame so that it causes the brake to act with increasing power toward and after the end of the operative cycle of the machine, for the purpose described.

vIn testimony whereof we afixpur signatures in presence of two witnesses.

JOHN VEASY COLLIER. ARTHUR WALLACE EDWARDS. 

